Would this work with a crossover cable, so you can avoid the (ridiculous) expense of a 10G switch if you wanted to connect only two PCs together?

The TP-Link TL-SX105 5-port 10Ggps is available now in late 2021 at a not quite so ridiculous expense of $320.

Will i get 10g speed over pcie 2.0?

PCIe1 is 250MB/sec per lane, PCIe2 is 500MB/sec per lane, PCIe3 is 800MB/sec per lane. So an x4 PCIe2 slot has..... 2Gb/sec transfer capability. 10gbe is 1.2Gb/sec transfer speeds, which falls nicely within a PCIe x4 slot. If you're computer can drive data that quickly is another question. A single consumer SATA SSD can only do 400-500MB/sec , and SATA3 can only do 600MB maximum, which is under the speed of the 10gbe. So unless you have a RAID setup with SSDs, you cannot exceed the ethernet connection. Or, a nice NVMe m.2 drive can do 3600MB/sec easily, which will hurt the 10gbe connection.

can this work as a 10gigabit connection in between 2 systems if both have one of these like from a file server to a workstation pc

Yes. That's exactly how I'm using a pair of them, between a Linux file server and desktop. I manually configured IP addresses and routes.

Is this card low profile? does it come with the low profile bracket?

The card comes with a standard size bracket but a low profile bracket is in the box.

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🚀 Upgrade your network, upgrade your hustle.

BLAZING 10 GBPS SPEED - Experience data transfers up to 10x faster than standard Gigabit Ethernet—perfect for bandwidth-heavy workflows.
SMART TRAFFIC MANAGEMENT - Built-in Quality-of-Service (QoS) lets you prioritize critical data streams for uninterrupted productivity.
CROSS PLATFORM POWERHOUSE - Effortlessly compatible with Windows 10/8.1/8/7 and multiple Linux kernels for ultimate OS flexibility.
PLUG AND PLAY RJ 45 UPGRADE - Transform your desktop with a single copper cable—no need for expensive rewiring or complex setups.
SEAMLESS BACKWARD COMPATIBILITY - Supports 10/5/2.5/1Gbps and 100Mbps standards, ensuring smooth integration with existing networks.

The ASUS XG-C100C is a PCI-E x4 network adapter delivering ultra-fast 10Gbps speeds with full backward compatibility and built-in QoS. Designed for professionals demanding seamless, high-bandwidth connectivity on Windows and Linux platforms, it upgrades any desktop with a standard RJ-45 port for next-level network performance.

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Wireless Type	802.11n
Number of USB 2.0 Ports	1
Brand	ASUS
Item model number	XG-C100C
Operating System	Windows 10/8.1/8/7 and Linux Kernel 4.4/4.2/3.6/3.2
Item Weight	3.2 ounces
Product Dimensions	3.33 x 0.81 x 4.73 inches
Item Dimensions LxWxH	3.33 x 0.81 x 4.73 inches
Color	red, grey
Voltage	220 Volts
Batteries	1 AAAA batteries required.
Manufacturer	ASUS Computer International Direct
Language	Italian
ASIN	B072N84DG6
Is Discontinued By Manufacturer	No
Date First Available	June 15, 2017

ASUS XG-C100C 10G Network Adapter PCI-E x4 Card with Single RJ-45 Port and Built-in QoS for use with Windows 10/8.1/8/7 and Linux Kernel 4.4/4.2/3.6/3.2 (XG-C100C)

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